Two-Sheets Detector

Using the principle of capacitance between two plates this circuit senses when more than one sheet of paper goes betwee
Two-Sheets Detector - schematic

n the sensing electrodes at a time. CI is the sensing capacitor formed of two plates. It consists of two plates 2" 15" with 0.1" spacing. A change of capacitance causes a change in oscillator frequency of the IC1 circuit, which is detected by IC2 and IC3.

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